CN211645126U - Continuous high-efficient pyrolysis system oil system of waste plastics - Google Patents
Continuous high-efficient pyrolysis system oil system of waste plastics Download PDFInfo
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- CN211645126U CN211645126U CN202020012992.0U CN202020012992U CN211645126U CN 211645126 U CN211645126 U CN 211645126U CN 202020012992 U CN202020012992 U CN 202020012992U CN 211645126 U CN211645126 U CN 211645126U
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Abstract
The utility model relates to a waste plastics processing technology field provides a continuous high-efficient pyrolysis system oil system of waste plastics, and this system includes first screw feeder, spout fluidized bed, first separator, condenser, calcination fluidized bed, second separator and rectifying column. A first jacket is arranged on the outer wall of the first screw feeder; a first inlet of the spouted fluidized bed is communicated with an outlet of the first screw feeder; the inlet of the first separator is communicated with the outlet of the spouted fluidized bed; the heavy oil outlet of the condenser is communicated with the second inlet of the spouted fluidized bed; the inlet of the second separator is communicated with the outlet of the roasting fluidized bed. The utility model provides a waste plastics continuous high-efficient pyrolysis system oil system, can make the carbon deposition catalyst possess catalytic ability again, realized the reuse of catalyst; the traditional external heating mode is changed into internal heating, so that the coking phenomenon is reduced; and a catalytic reforming tower is not needed, so that the operation cost and the complexity of the system are reduced.
Description
Technical Field
The utility model relates to a waste plastics processing technology field, concretely relates to continuous high-efficient pyrolysis system oil system of waste plastics.
Background
With the development of modern industry, a large amount of waste materials such as waste plastics are generated every year. Waste plastics are not easily degraded in natural environment, and generally contain toxic substances, so that the environment is greatly damaged by incineration and landfill treatment. At present, recycling waste plastics and pyrolysis are the best way to produce oil.
The tank reactor and the tubular reactor are mainly adopted in China for producing oil by pyrolyzing waste plastics. There are many problems with the conventional apparatus and equipment for processing waste plastics at present: the used catalyst and impurities are discharged together, and the catalyst cannot be reused; the external heating mode easily causes uneven heating of the waste plastics in the reactor, so that a large amount of coke residues are generated, and the residues are adhered to the wall and the bottom of the reactor, so that the coking phenomenon is caused; the quality of heavy oil generated by catalytic cracking reaction can not be improved only by rectification treatment, so a catalytic reforming tower is needed, the operation cost is increased, and the complexity of the system is increased.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a system for producing oil by continuously and efficiently pyrolyzing waste plastics, which can recycle the catalyst; the waste plastics in the reactor are uniformly heated by adopting an internal heating mode, so that the occurrence of coking phenomenon is reduced; the quality of heavy oil can be improved without using a catalytic reforming tower, and the operation cost and the complexity of a system are reduced.
In order to achieve the above purpose, the present invention is implemented by the following technical solutions: a continuous high-efficient pyrolysis oil production system of waste plastics includes: the device comprises a first screw feeder, a spouted fluidized bed, a first separator, a condenser, a roasting fluidized bed, a second separator and a rectifying tower;
a first jacket is arranged on the outer wall of the first screw feeder;
the first inlet of the spouted fluidized bed is communicated with the outlet of the first screw feeder;
the inlet of the first separator is communicated with the outlet of the spouted fluidized bed, the gas outlet of the first separator is communicated with the inlet of the condenser, and the solid outlet of the first separator is communicated with the first inlet at the lower part of the roasting fluidized bed;
the heavy oil outlet of the condenser is communicated with the second inlet of the spouted fluidized bed, the oil-gas mixture outlet of the condenser is communicated with the inlet of the rectifying tower, and the second inlet of the spouted fluidized bed is positioned above the first inlet;
the inlet of the second separator is communicated with the outlet of the roasting fluidized bed, the gas outlet of the second separator is communicated with a chimney, and the solid outlet of the second separator is communicated with the second inlet of the spouted fluidized bed;
and a liquid outlet of the rectifying tower is communicated with the oil storage tank, and a gas outlet of the rectifying tower is communicated with a second inlet in the middle of the roasting fluidized bed and a third inlet at the bottom of the spouted fluidized bed.
Further, still include booster pump and nozzle, the entry of booster pump with the export of first screw feeder communicates, the export of booster pump with the entry of nozzle communicates, the export of nozzle with the first entry of spout fluidized bed communicates.
And the device further comprises a second screw feeder which is obliquely arranged, an inlet at the upper end of the second screw feeder is communicated with the solid outlet of the first separator, and an outlet at the lower end of the second screw feeder is communicated with the first inlet at the lower part of the roasting fluidized bed.
Further, the included angle between the axis of the second screw feeder and the horizontal plane is 15-75 degrees.
The outer wall of the second screw feeder is provided with a second jacket, the outer wall of the condenser is provided with a third jacket, an air outlet of the blower is communicated with an inlet of the second jacket, an outlet of the second jacket is communicated with an inlet of the third jacket, an outlet of the third jacket is communicated with an inlet of the first jacket, and an outlet of the first jacket is communicated with a third inlet at the bottom of the roasting fluidized bed.
The inlet of the air preheater is communicated with the gas outlet of the second separator, the outlet of the air preheater is communicated with the chimney, the inlet of the heat exchange tube of the air preheater is communicated with the outlet of the third jacket, and the outlet of the heat exchange tube of the air preheater is communicated with the inlet of the first jacket.
Further, the smoke treatment device is further included, an inlet of the smoke treatment device is communicated with an outlet of the air preheater, and an outlet of the smoke treatment device is communicated with the chimney.
The utility model has the advantages that: the utility model provides a waste plastics continuous high-efficient pyrolysis system oil system burns the carbon on carbon deposition catalyst surface through the calcination fluidized bed, makes carbon deposition catalyst possess catalytic ability once more, has realized the reuse of catalyst; the catalyst after roasting treatment is sent into a spouted fluidized bed to be used as a heat source and a catalytic source, and the traditional external heating mode is changed into internal heating, so that the occurrence of coking phenomenon is reduced; heavy oil in the oil-gas mixture flows back to the spouted fluidized bed for further catalytic cracking, a catalytic reforming tower is not needed, and the operation cost and the complexity of the system are reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a process flow chart of the present invention.
Reference numerals: 1-a first screw feeder, 11-a first jacket, 2-a spouted fluidized bed, 3-a first separator, 4-a condenser, 41-a heavy oil outlet, 42-an oil-gas mixture outlet, 43-a third jacket, 5-a roasting fluidized bed, 6-a second separator, 7-a rectifying tower, 8-a chimney, 9-an oil storage tank, 10-a booster pump, 12-a nozzle, 13-a second screw feeder, 131-a second jacket, 14-a blower, 15-an air preheater, 151-a heat exchange tube, 16-a flue gas treatment device, 17-an induced draft fan and 18-a material return valve.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
In this application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present application, it is to be understood that the terms "longitudinal," "lateral," "horizontal," "top," "bottom," "upper," "lower," "inner" and "outer" and the like are used in the orientation or positional relationship shown in the drawings, which are used for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
As shown in fig. 1-2, the utility model provides a continuous high-efficient pyrolysis system oil system of waste plastics, including first screw feeder 1, spout fluidized bed 2, first separator 3, condenser 4, calcination fluidized bed 5, second separator 6 and rectifying column 7.
The outer wall of the first screw feeder 1 is provided with a first jacket 11, and a heat medium can be introduced into the first jacket 11, so that the substances in the first screw feeder 1 can be heated. The first inlet of the spouted fluidized bed 2 is communicated with the outlet of the first screw feeder 1.
Waste plastics enter the first screw feeder 1 and become plastic melt under the heating of the first jacket 11, and the plastic melt advances in the axial direction under the pushing of the rotating blades in the first screw feeder 1 and enters the spouted fluidized bed 2. The spouted bed 2 is previously packed with a catalyst comprising a catalyst for catalytic cracking reaction and a catalyst for catalytic reforming reaction, which is a mixture of the two catalysts. The catalyst promotes the plastic melt to generate catalytic cracking reaction in the spouted fluidized bed 2, the plastic melt is converted into an oil-gas mixture through the catalytic cracking reaction, and the surface of the catalyst is covered with carbon deposition to form a carbon deposition catalyst, so that the catalytic capability is lost.
Preferably, the first separator 3 is a cyclone separator, the inlet of the first separator 3 is communicated with the outlet of the spouted fluidized bed 2, the gas outlet of the first separator 3 is communicated with the inlet of the condenser 4, and the solid outlet of the first separator 3 is communicated with the first inlet at the lower part of the roasting fluidized bed 5.
The heavy oil outlet 41 of the condenser 4 is communicated with the second inlet of the spouted fluidized bed 2, the oil-gas mixture outlet 42 of the condenser 4 is communicated with the inlet of the rectifying tower 7, and the second inlet of the spouted fluidized bed 2 is positioned above the first inlet.
The first separator 3 discharges the oil-gas mixture from the gas outlet into the condenser 4. Under the action of the condenser 4, heavy oil in the oil-gas mixture is condensed and flows downwards along the pipe wall, and finally is discharged from a heavy oil outlet 41, and flows back into the spouted fluidized bed 2 from a second inlet through a collecting tank for catalytic upgrading. Other components in the oil gas mixture are discharged from the oil gas mixture outlet 42 and enter the rectifying tower 7 for rectification treatment.
The liquid outlet of the rectifying tower 7 is communicated with the oil storage tank 9, and the gas outlet of the rectifying tower 7 is communicated with the second inlet in the middle of the roasting fluidized bed 5 and the third inlet at the bottom of the spouted fluidized bed 2.
The rectification treatment produces light oil and cracked gas. The light oil enters the oil storage tank 9 from the liquid outlet for storage. The pyrolysis gas is discharged from a gas outlet, after being pressurized by the draught fan 17, one part of the pyrolysis gas enters the spouted fluidized bed 2 as a fluidizing medium to promote the catalytic pyrolysis reaction, and the other part of the pyrolysis gas enters the roasting fluidized bed 5 to be combusted and released heat.
The deposited carbon catalyst is discharged from the solid outlet of the first separator 3 and enters the roasting fluidized bed 5 through the first inlet at the lower portion of the roasting fluidized bed 5. The carbon deposition catalyst is roasted in the roasting fluidized bed 5. The temperature of the roasting treatment reaches 800-.
The second separator 6 is also preferably a cyclone separator, the inlet of the second separator 6 is in communication with the outlet of the roasting fluidized bed 5, the gas outlet of the second separator 6 is in communication with the stack 8, and the solids outlet of the second separator 6 is in communication with the second inlet of the spouted fluidized bed 2.
The second separator 6 discharges the regenerated catalyst from the solid outlet, and the regenerated catalyst enters the spouted fluidized bed 2 after passing through the material return valve 18, and the material return valve 18 plays a role of a switch, so that workers can conveniently control the amount of the regenerated catalyst entering the spouted fluidized bed 2. The regenerated catalyst is roasted, so that the temperature reaches 800-900 ℃, and the regenerated catalyst is used as a heat source and a catalytic source after entering the spouted fluidized bed 2, promotes the catalytic cracking reaction of the plastic melt in an internal heating mode, and simultaneously promotes the catalytic upgrading of the heavy oil. The hot flue gases are discharged through a chimney 8.
In one embodiment, a booster pump 10 and a nozzle 12 are also included. An inlet of the booster pump 10 is communicated with an outlet of the first screw feeder 1, an inlet of an outlet nozzle 12 of the booster pump 10 is communicated, and an outlet of the nozzle 12 is communicated with a first inlet of the spouted fluidized bed 2.
The plastic melt in the first screw feeder 1 firstly enters the booster pump 10 to be pressurized, and then the nozzle 12 atomizes the pressurized plastic melt. The plastic melt is then sprayed into the spouted fluidized bed 2 in the form of small droplets, increasing the contact area of the plastic melt with the catalyst in the spouted fluidized bed 2 and increasing the catalytic cracking reaction rate of the plastic melt.
In one embodiment, a second screw feeder 13 is included, which is arranged obliquely. An inlet at the upper end of the second screw feeder 13 is communicated with a solid outlet of the first separator 3, and an outlet at the lower end of the second screw feeder 13 is communicated with a first inlet at the lower part of the roasting fluidized bed 5.
Therefore, the carbon deposition catalyst in the second screw feeder 13 can naturally move downwards under the action of gravity, and sealing is realized by means of self gravity, so that hot flue gas in the roasting fluidized bed 5 is prevented from flowing backwards to enter the first separator 3.
In one embodiment the axis of the second screw feeder 13 is at an angle of 15-75 deg. to the horizontal. In the angle range, the carbon deposition catalyst can better realize sealing while moving downwards depending on gravity, and hot flue gas in the roasting fluidized bed 5 is prevented from flowing back to enter the first separator 3.
In one embodiment, a blower 14 is also included. The outer wall of the second screw feeder 13 is provided with a second jacket 131, the outer wall of the condenser 4 is provided with a third jacket 43, the air outlet of the blower 14 is communicated with the inlet of the second jacket 131, the outlet of the second jacket 131 is communicated with the inlet of the third jacket 43, the outlet of the third jacket 43 is communicated with the inlet of the first jacket 11, and the outlet of the first jacket 11 is communicated with the third inlet at the bottom of the roasting fluidized bed 5.
The normal temperature air blown by the blower 14 enters the second jacket 131, exchanges heat with the carbon deposition catalyst in the second screw feeder 13, and absorbs the heat of the carbon deposition catalyst; then enters a third jacket 435 to serve as a cold source, exchanges heat with the oil-gas mixture in the condenser 4, promotes the condensation of heavy oil in the oil-gas mixture, and absorbs the heat of the oil-gas mixture; the temperature of the air is high enough, and then the air enters the first jacket 11 to serve as a heat source to heat the waste plastics in the first screw feeder 1 to form plastic melt; and finally enters a roasting fluidized bed 5 to support combustion and promote the roasting treatment. The circulation fully utilizes the heat of the carbon deposition catalyst and the oil-gas mixture.
In one embodiment, an air preheater 15 is also included. The inlet of the air preheater 15 is communicated with the gas outlet of the second separator 6, the outlet of the air preheater 15 is communicated with the chimney 8, the inlet of the heat exchange tube 151 of the air preheater 15 is communicated with the outlet of the third jacket 43, and the outlet of the heat exchange tube 151 of the air preheater 15 is communicated with the inlet of the first jacket 11.
The hot flue gas is discharged from the gas outlet of the second separator 6 and enters the air preheater 15, the air blown by the blower 14 absorbs heat in the second jacket 131 and the third jacket 43 and enters the heat exchange tube 151 to exchange heat with the hot flue gas, so that the heat of the air blown by the blower 14 is further increased, and the waste plastics can be heated by the air subsequently entering the first jacket 11. The heat exchange tubes 151 are arranged in a serpentine shape, so that the contact area with hot flue gas is increased, and the heat exchange efficiency is improved. The air preheater 15 makes full use of the heat of the hot flue gases.
In one embodiment, a flue gas treatment device 16 is also included. The inlet of the flue gas treatment device 16 is communicated with the outlet of the air preheater 15, and the outlet of the flue gas treatment device 16 is communicated with the chimney 8.
Because hot flue gas contains more harmful substance, direct emission can pollute air and environment, consequently need flue gas processing apparatus 16 to carry out purification treatment to it before discharging, be favorable to protecting air and environment.
Having shown and described the basic principles and essential features of the invention and the advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a continuous high-efficient pyrolysis system oil system of waste plastics which characterized in that: comprises a first screw feeder, a spouted fluidized bed, a first separator, a condenser, a roasting fluidized bed, a second separator and a rectifying tower;
a first jacket is arranged on the outer wall of the first screw feeder;
the first inlet of the spouted fluidized bed is communicated with the outlet of the first screw feeder;
the inlet of the first separator is communicated with the outlet of the spouted fluidized bed, the gas outlet of the first separator is communicated with the inlet of the condenser, and the solid outlet of the first separator is communicated with the first inlet at the lower part of the roasting fluidized bed;
the heavy oil outlet of the condenser is communicated with the second inlet of the spouted fluidized bed, the oil-gas mixture outlet of the condenser is communicated with the inlet of the rectifying tower, and the second inlet of the spouted fluidized bed is positioned above the first inlet;
the inlet of the second separator is communicated with the outlet of the roasting fluidized bed, the gas outlet of the second separator is communicated with a chimney, and the solid outlet of the second separator is communicated with the second inlet of the spouted fluidized bed;
and a liquid outlet of the rectifying tower is communicated with the oil storage tank, and a gas outlet of the rectifying tower is communicated with a second inlet in the middle of the roasting fluidized bed and a third inlet at the bottom of the spouted fluidized bed.
2. The continuous and efficient waste plastic pyrolysis oil production system according to claim 1, characterized in that: the spraying device is characterized by further comprising a booster pump and a nozzle, wherein an inlet of the booster pump is communicated with an outlet of the first screw feeder, an outlet of the booster pump is communicated with an inlet of the nozzle, and an outlet of the nozzle is communicated with a first inlet of the spraying fluidized bed.
3. The continuous and efficient waste plastic pyrolysis oil production system according to claim 1, characterized in that: the device also comprises a second screw feeder which is obliquely arranged, an inlet at the upper end of the second screw feeder is communicated with the solid outlet of the first separator, and an outlet at the lower end of the first screw feeder is communicated with the first inlet at the lower part of the roasting fluidized bed.
4. The continuous and efficient waste plastic pyrolysis oil production system according to claim 3, characterized in that: the included angle between the axial lead of the second screw feeder and the horizontal plane is 15-75 degrees.
5. The continuous and efficient waste plastic pyrolysis oil production system according to claim 3, characterized in that: the outer wall of the second screw feeder is provided with a second jacket, the outer wall of the condenser is provided with a third jacket, an air outlet of the air blower is communicated with an inlet of the second jacket, an outlet of the second jacket is communicated with an inlet of the third jacket, an outlet of the third jacket is communicated with an inlet of the first jacket, and an outlet of the first jacket is communicated with a third inlet at the bottom of the roasting fluidized bed.
6. The continuous and efficient waste plastic pyrolysis oil production system according to claim 5, characterized in that: the inlet of the air preheater is communicated with the gas outlet of the second separator, the outlet of the air preheater is communicated with the chimney, the inlet of the heat exchange tube of the air preheater is communicated with the outlet of the third jacket, and the outlet of the heat exchange tube of the air preheater is communicated with the inlet of the first jacket.
7. The continuous and efficient waste plastic pyrolysis oil production system according to claim 6, characterized in that: still include flue gas processing apparatus, flue gas processing apparatus's entry with air heater's export intercommunication, flue gas processing apparatus's export with the chimney intercommunication.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020012992.0U CN211645126U (en) | 2020-01-03 | 2020-01-03 | Continuous high-efficient pyrolysis system oil system of waste plastics |
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| CN202020012992.0U CN211645126U (en) | 2020-01-03 | 2020-01-03 | Continuous high-efficient pyrolysis system oil system of waste plastics |
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| CN211645126U true CN211645126U (en) | 2020-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111040794A (en) * | 2020-01-03 | 2020-04-21 | 重庆科技学院 | System and process for producing oil by continuously and efficiently pyrolyzing waste plastics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111040794A (en) * | 2020-01-03 | 2020-04-21 | 重庆科技学院 | System and process for producing oil by continuously and efficiently pyrolyzing waste plastics |
| CN111040794B (en) * | 2020-01-03 | 2023-12-22 | 重庆科技学院 | System and process for producing oil by continuous and efficient pyrolysis of waste plastics |
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